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Epidemic neonatal gentamicin-methicillin--resistant Staphylococcus aureus infection associated with nonspecific
Insights
Topical gentamicin ointment use increased the risk of acquiring gentamicin-methicillin-resistant Staphylococcus aureus (GMRS) in neonatal intensive care units. This finding highlights a critical factor in preventing GMRS infections in vulnerable infants.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Microbiology
Background:
- Neonatal intensive care units (NICUs) are susceptible environments for healthcare-associated infections.
- Staphylococcus aureus, particularly resistant strains, poses a significant threat to vulnerable infants.
Purpose of the Study:
- To investigate risk factors associated with the acquisition of gentamicin-methicillin-resistant Staphylococcus aureus (GMRS) in an NICU population.
- To identify specific interventions or exposures linked to GMRS acquisition.
Main Methods:
- Retrospective cohort study analyzing data from 116 infants who acquired GMRS and 54 who acquired gentamicin-methicillin-sensitive S. aureus (GMSS).
- Statistical analysis, including multivariate logistic regression, was used to identify significant risk factors.
- Comparison of patient demographics, clinical characteristics, and treatment exposures between GMRS and GMSS groups.
Main Results:
- Topical application of gentamicin ointment (GmO) was significantly associated with GMRS acquisition (P = 8.6 X 10(-8)).
- Infants with GMRS had lower birth weight, Apgar scores, and gestational age compared to GMSS infants.
- Prolonged systemic antibiotic therapy and incubator care were observed in GMRS patients but did not fully explain susceptibility.
Conclusions:
- Topical gentamicin ointment use is a critical and independent risk factor for GMRS acquisition in NICU infants.
- Findings suggest a need to re-evaluate the use of topical gentamicin in high-risk neonatal populations.
- Implementing targeted infection control strategies is crucial to mitigate GMRS transmission.
Abstract:
One hundred sixteen infants in an intensive care nursery acquired Staphylococcus aureus resistant to gentamicin and methicillin; 54 patients acquired S. aureus sensitive to gentamicin and methicillin. Topical application of gentamicin ointment was significantly associated with acquisition of GMRS. Of 78 infants who acquired GMRS, 38 had received GmO before GMRS was first cultured, whereas only one of 49 infants with GMSS had previously received GmO (P = 8.6 X 10(-8)). Infants with GMRS were also more likely than patients with GMSS to have had a lower mean birth weight, Apgar score, and gestational age; systemic antibiotic therapy and incubator care were significantly prolonged for patients with GMRS, but these factors did not explain susceptibility to GMRS infection. Multivariate logistic regression analysis showed that use of GmO was the single most important risk factor.